Expansion valve



FIG. 1 is a perspective view of an expansion valve showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing is for the purpose of illustrating portions of the expansion valve and forms no part of the claimed design. 

CLAIM The ornamental design for an expansion valve, as shown and described. 